EXTRACTION METHOD FOR ION-ADSORBED RARE EARTHS

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The present invention provides an extraction method for ion-adsorbed rare earths. The extraction method comprises the following steps : S1, using calcium chloride solution as a leaching agent to perform leaching on ion-adsorbed rare earth ore, such that rare earths are extracted into the leaching solution in the form of ions, wherein the initial leachate containing rare earths is collected in a first container, and the subsequent leachate containing rare earths is collected in a second container; S2, using aluminum sulfate solution as a leaching agent to perform a second leaching on the ion-adsorbed rare earth ore, such that the remaining rare earths in the rare earth ore are extracted into the leaching solution in the form of ions, wherein the leachate having a pH value greater than 4 is still collected in the second container, the leachate having a pH value less than 4 is collected in the third container; S3, using lime water to leach the leached ion-adsorbed rare earth ore tailings; and then, leaching with water until the pH value of the leaching solution is greater than 6, wherein the leachate having a pH value of less than 4 is collected in the third container, and the leachate having a pH value of greater than 4 is still collected in the first container.